APR vs Effective Rate
Learn what APR really means in the UK, how daily interest is calculated on credit cards, and why the stated APR can differ dramatically from the actual cost of borrowing.
APR vs Effective Rate
APR is printed on every credit agreement in the UK, yet most people do not fully understand what it represents — or why it can be misleading.
What APR Actually Means
APR (Annual Percentage Rate) is a standardised way of expressing the cost of borrowing over a year, including compounding. In the UK, lenders are required by the Consumer Credit Act 1974 (as amended) and FCA regulations to quote a "representative APR" in their advertising.
The key rule: at least 51% of successful applicants must receive the advertised representative APR. The other 49% could be offered a higher rate.
Representative APR vs. Personal APR
| Term | Meaning |
|---|---|
| Representative APR | The rate advertised; at least 51% of approved applicants get this or better |
| Personal APR | The rate you actually receive, based on your creditworthiness |
As of early 2026, the average UK credit card APR is approximately 23–25%. Premium rewards cards may charge 25–30%, while some basic cards sit around 19–22%.
How Daily Interest Works on Credit Cards
Credit card interest is typically calculated daily on the outstanding balance:
Daily rate = APR ÷ 365
For a card with 23% APR:
Daily rate = 23% ÷ 365 = 0.063% per day
On a £2,000 balance, that is roughly £1.26 per day in interest. Over a full month (30 days), that adds approximately £37.80 before compounding.
Because interest compounds daily (today's interest is added to tomorrow's balance), the effective annual rate (EAR) is slightly higher than the stated APR. For 23% APR compounded daily:
EAR ≈ (1 + 0.23/365)^365 − 1 ≈ 25.8%
Why Stated APR Can Be Misleading
Several factors cause the real cost to differ from the headline APR:
- Fees are sometimes excluded. Annual fees, cash advance fees, and balance transfer fees may not be reflected in the representative APR.
- Promotional rates expire. A 0% purchase card reverts to the standard rate (often 22–25%) once the offer ends.
- Partial payments accrue interest. If you pay less than the full statement balance, most cards charge interest on the entire amount from the transaction date — not just the unpaid portion. This is called losing your interest-free period.
- Cash advances. Withdrawing cash on a credit card typically attracts a higher rate (often 25–30%) from the day of the withdrawal, with no interest-free period.
Comparing Loan APR vs. Credit Card APR
| Feature | Personal Loan | Credit Card |
|---|---|---|
| Interest type | Usually fixed | Variable (can change) |
| Compounding | Monthly or annually | Daily |
| Repayment | Fixed monthly payments | Flexible (minimum or more) |
| Typical APR (2026) | 6–15% | 19–30% |
| Early repayment | May have fees (up to 58 days' interest) | No penalty for overpaying |
A personal loan at 8% APR is almost always cheaper than carrying a credit card balance at 23% APR. If you have existing card debt and cannot clear it quickly, a debt consolidation loan may reduce total interest.
The Golden Rule
Pay your statement balance in full every month. If you do this, the APR is irrelevant — you pay zero interest during the interest-free period (typically 45–56 days from the transaction date).
Explain Like I'm 5
When you borrow sweets from the sweetshop, the shopkeeper charges you extra sweets for the favour. APR is how many extra sweets you owe after a whole year. The trick is: if you always pay back all your sweets before bedtime, you never owe any extra at all!
Key Takeaways
- Representative APR only applies to at least 51% of approved applicants — your rate may be higher.
- Credit card interest compounds daily, making the effective annual rate higher than the stated APR.
- Paying your full statement balance each month means you pay zero interest regardless of the APR.
- Cash advances attract a higher rate with no interest-free period — avoid them where possible.
Educational only - not financial advice